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Bacteria Growth

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Join Date: Oct 2009

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kulrik

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Bacteria Growth

20 Days Ago

Having trouble with this one:

The formula y = nekt can be used for estimating growth where

n is the initial amount
k is a constant
t is the time
y is the final amount

This formula will be used for estimating the bacteria growth in a lab experiment. The output should look similar to:

Enter intial bacteria amount:
5.0
Enter a constant value for k:
0.8

Time(hours) Bacteria

1 11.13
2 24.77
3 55.12
4 122.66
5 272.99
6 607.55
7 1352.13
8 3009.23

In the class Mymath , write two different methods:

a. Prompts the user initial bacteria and the constant k in the method.

b. Get the user initial bacteria and the constant k from the main method.

Write a main method to test the two methods above.

My coding:

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
import java.util.Scanner;
public class bacteriagrowth 
{
	public static void main(String []args)
	{
		Scanner input = new Scanner (System.in);
		double n;
		System.out.println("Enter initial bacteria amount: ");
		n = input.nextDouble();
		double k;
		System.out.println("Enter a constant value for k: ");
		k = input.nextDouble();
		double t = 1;
		double y = 0;
		while (t<=8)
		{
		y = Math.pow(n*Math.E, (k*t));
		t = t +1;
		}
		System.out.printf("time" + t, y);
 
	}
 
}
import java.util.Scanner;
public class bacteriagrowth 
{
	public static void main(String []args)
	{
		Scanner input = new Scanner (System.in);
		double n;
		System.out.println("Enter initial bacteria amount: ");
		n = input.nextDouble();
		double k;
		System.out.println("Enter a constant value for k: ");
		k = input.nextDouble();
		double t = 1;
		double y = 0;
		while (t<=8)
		{
		y = Math.pow(n*Math.E, (k*t));
		t = t +1;
		}
		System.out.printf("time" + t, y);
		
	}

}

Last edited by peter_budo; 20 Days Ago at 4:01 pm. Reason: Please do not use Code Snipets for asking questions. Use Forum Thread option.

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masijade

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Nearly a Posting Maven

20 Days Ago

Okay? And your question is?

Last edited by masijade; 20 Days Ago at 3:15 am.

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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
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Join Date: Oct 2009

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kulrik

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20 Days Ago

i dont know what im doing wrong. You think you can help me?

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19 Days Ago

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Originally Posted by kulrik

i dont know what im doing wrong. You think you can help me?

Are you getting an error message? All you've said is the question, and your code. Is there a problem, if so, what is it?

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Join Date: Oct 2009

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kulrik

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19 Days Ago

im not getting the output my teacher wants.

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shibby

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19 Days Ago

I think the problem here is that you are calculating the formula in the wrong way your calculation is:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
y = Math.pow(n*Math.E, (k*t));
y = Math.pow(n*Math.E, (k*t));

what this does is multiply E by n, then raise this product by (k*t). Instead what you want to do to get the correct answer is raise E by the product (k*t) then multiply this answer by n to get the correct number. Be careful of the order in which you apply calculations.
Since this is homework I won't give you the correct code but you should be able to do it by yourself anyway. Let us know if this works.